Drive Cycle - Subaru Legacy 2005 Service Manual

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ENGINE (DIAGNOSTICS)

12.Drive Cycle

A: PROCEDURE

There are three drive patterns for the trouble diagnosis. Driving in the specified pattern allows to diagnose

malfunctioning items listed below. After the repair of the following trouble items, be sure to drive the vehicle

with the specified drive patterns to check whether the function is resumed correctly.

KA and KS model is the same as 2.0 L model. Refer to EN(H4SO 2.0) section.

1. PREPARATION FOR DRIVE CYCLE

1) Check that the battery voltage is more than 12 V and fuel remains half [20 — 40 2 (5.3 — 10.6 US gal,

4.4 — 8.8 Imp gal)].

2) After performing the diagnostics and clearing the memory, check for any remaining unresolved trouble da-

ta. <Ref. to EN(H4SO 2.5)(diag)-40, Clear Memory Mode.>

3) Separate the test mode connector.

• Perform the diagnosis after warming up the engine except when the engine coolant temperature at starting

is specified.

• Perform the diagnosis twice if the DTC marked with *. After completing the first diagnosis, stop the engine

and perform second diagnosis in same condition.

2. DRIVE THE VEHICLE WITH 80 KM/H (50 MPH) FOR 20 MINUTES, AND THEN IDLE THE EN-

GINE FOR A MINUTE.

Insufficient Coolant Temperature for Closed Loop Fuel Control

O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)

Catalyst System Efficiency Below Threshold (Bank 1)

Evaporative Emission System Purge Valve Circuit High

3. 10 MINUTES IDLING

Drive the vehicle in more than 10 km/h (6 MPH) before diagnosis.

HO2S Heater Control Circuit (Bank 1 Sensor 1)

EN(H4SO 2.5)(diag)-38

Engine coolant temperature at

engine start is 20°C (68°F) or

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